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Library of Congress Subject Areas (19021)
- A General Works (84)
  - AC Collections. Series. Collected works (27)
  - AI Indexes (General) (31)
  - AM Museums (General). Collectors and collecting (General) (5)
  - AS Academies and learned societies (General) (28)
  - AZ History of Scholarship The Humanities (4)
- B Philosophy. Psychology. Religion (44)
  - B Philosophy (General) (4)
  - BC Logic (1)
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  - BP Islam. Bahaism. Theosophy, etc (17)
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- C Auxiliary Sciences of History (5)
  - C Auxiliary sciences of history (General) (1)
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- D History General and Old World (5)
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    - D051 Ancient History (2)
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- E History America (1)
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- F History United States, Canada, Latin America (1)
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- G Geography. Anthropology. Recreation (59)
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- H Social Sciences (6630)
  - H Social Sciences (General) (1441)
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  - HB Economic Theory (495)
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  - HD Industries. Land use. Labor (870)
    - HD1401 Agriculture-Economic aspects (104)
    - HD28 Management. Industrial Management (303)
    - HD30.213 Decision Support Systems (17)
    - HD30.27 Business Forecasting (34)
    - HD30.28 Strategic Planning (77)
    - HD30.3 Communication in Organizations (39)
    - HD38.5 Supply Chain Management (68)
    - HD59-59.6 Public relations. Industrial publicity (35)
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    - HD9000 Agricultural Industries (105)
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  - HE Transportation and Communications (67)
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- J Political Science (994)
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- L Education (856)
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  - LD Individual institutions (United States) (2)
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- M Music and Books on Music (17)
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- N Fine Arts (1066)
  - N Visual arts (419)
    - N400-3990 Art museums, galleries, etc. (17)
    - N61-72 Theory. Philosophy. Aesthetics of the visual arts (51)
    - N81-390 Study and teaching. Research (53)
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  - NA Architecture (436)
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  - NX Arts in general (152)
- P Language and Literature (444)
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    - P302-302.87 Discourse analysis (5)
    - P87 Communication. Mass Media (340)
    - P94.7 Interpersonal communication (32)
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- Q Science (1495)
  - Q Science (General) (417)
  - QA Mathematics (846)
    - QA76.87 Neural computers (40)
    - QA75 Electronic computers. Computer science (247)
    - QA76 Computer software (191)
    - QA76.6 Computer Programming (419)
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    - QA76.76.E95 Expert Systems (16)
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  - QC Physics (31)
  - QD Chemistry (276)
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    - QH301 Biology (3)
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- R Medicine (28)
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    - RA1001 Forensic Medicine. Medical jurisprudence. Legal medicine (1)
  - RE Ophthalmology (1)
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  - RM Therapeutics. Pharmacology (1)
  - RS Pharmacy and materia medica (2)
  - RZ Other systems of medicine (1)
- S Agriculture (1568)
  - S Agriculture (General) (1344)
    - S590-599.9 Soils. Soil science (176)
    - S631-667 Fertilizers and Improvement of the soil (156)
  - SB Plant culture (276)
    - SB599-990.5 Pests and Diseases (69)
    - SB950-989 Pest Control and Treatment of Diseases, Plant Protection (141)
  - SD Forestry (31)
  - SF Animal culture (22)
  - SH Aquaculture. Fisheries. Angling (27)
  - SK Hunting sports (1)
- T Technology (5936)
  - T Technology (General) (2142)
    - T55.4-60.8 Industrial engineering. Management engineering (506)
    - T201 Patents. Trademarks (8)
    - T385 Computer Graphics (129)
    - T58.6-58.62 Management Information Systems (630)
  - TA Engineering (General). Civil engineering (General) (668)
  - TC Hydraulic engineering. Ocean engineering (12)
  - TD Environmental technology. Sanitary engineering (953)
  - TE Highway engineering. Roads and pavements (52)
  - TF Railroad engineering and operation (9)
  - TG Bridge engineering (9)
  - TH Building construction (79)
  - TJ Mechanical engineering and machinery (61)
  - TK Electrical engineering. Electronics Nuclear engineering (114)
    - TK5105 Computer Network (47)
    - TK5105.882 Internet (44)
    - TK5105.888 World Wild Web (47)
  - TL Motor vehicles. Aeronautics. Astronautics (4)
  - TN Mining engineering. Metallurgy (9)
  - TP Chemical technology (1932)
    - TP155 Chemical engineering (1447)
    - TP368 Food processing and manufacture (346)
    - TP500 Fermentation industries. Beverages. Alcohol (16)
  - TR Photography (13)
  - TS Manufactures (262)
    - TS 155-194 Production Management, Operations Management (185)
    - TS 180-TS180.8 Material Handling (13)
  - TT Handicrafts Arts and crafts (11)
  - TX Home economics (18)
- U Military Science (9)
  - U Military Science (General) (9)
- V Naval Science (7)
  - V Naval Science (General) (2)
  - VM Naval architecture. Shipbuilding. Marine engineering (5)
- Z Bibliography. Library Science. Information Resources (77)
  - Z004 Books. Writing. Paleography (4)
  - Z665 Library Science. Information Science (45)
  - Z719 Libraries (General) (11)
  - ZA Information resources (26)
    - ZA4050 Electronic information resources (9)
    - ZA4450 Databases (14)